If you selected that you want to receive mail through a Unix mbox Spool File or Directories, you will now see a page of options to specify the behavior of Evolution.
Select Check for new messages every ... minutes if you want Evolution to automatically check for new mail. Set how often to check.
Select Apply filters to new messages in Inbox if you want to apply filters to new messages.
Select Store status headers in Elm/Pine/Mutt format to store status headers in a way compatible with Elm, Pine, and Mutt.
Proceed to the next page.